hddennis Posted January 30, 2019 Share Posted January 30, 2019 Anyone had one these capillary tubes replaced in the recent past? Trying to find out the approximate cost to have this done. Howard Dennis Link to comment Share on other sites More sharing options...
Gary_Ash Posted January 30, 2019 Share Posted January 30, 2019 Basic price from “The Temperature Gauge Guy” in Vermont is about $85, more if parts missing or broken. Link to comment Share on other sites More sharing options...
Ivan Saxton Posted January 30, 2019 Share Posted January 30, 2019 The technical trick to make a soldered connection to the glass tube is to etch the ends to which the connecting pipes must be attached. Colour the etched surface with graphite powder, which adheres to it. You electroplate the graphited surface with copper, and you can solder to that. For etching the glass it is probably best done with fine blasting grit through a small sand blasting pot gun . Hydrofluoric acid (HF) is the commercial glass etchant, but it is too dangerous to store and use. HF is one of the most dangerous chemicals known, and there is no way I would ever use it. Link to comment Share on other sites More sharing options...
hddennis Posted January 31, 2019 Author Share Posted January 31, 2019 7 hours ago, Gary_Ash said: Basic price from “The Temperature Gauge Guy” in Vermont is about $85, more if parts missing or broken. Thanks Gary, appreciate the response. Any idea of approximate turn around time? Howard Dennis Link to comment Share on other sites More sharing options...
hddennis Posted January 31, 2019 Author Share Posted January 31, 2019 (edited) 6 hours ago, Ivan Saxton said: The technical trick to make a soldered connection to the glass tube is to etch the ends to which the connecting pipes must be attached. Colour the etched surface with graphite powder, which adheres to it. You electroplate the graphited surface with copper, and you can solder to that. For etching the glass it is probably best done with fine blasting grit through a small sand blasting pot gun . Hydrofluoric acid (HF) is the commercial glass etchant, but it is too dangerous to store and use. HF is one of the most dangerous chemicals known, and there is no way I would ever use it. Ivan, I'm confused and believe we are talking about two different gauges?? My gauge has a copper tube full of ether that expands a flat tube inside the gauge which moves the needle. I think they call this a Bourdon tube gauge. Howard Dennis Edited January 31, 2019 by hddennis (see edit history) Link to comment Share on other sites More sharing options...
Curti Posted January 31, 2019 Share Posted January 31, 2019 I have the capillary line and fittings that run from the tank to the gauge as well as the red fluid that does NOT turn clear from the ultra violate light. Link to comment Share on other sites More sharing options...
Gary_Ash Posted January 31, 2019 Share Posted January 31, 2019 I think we’re talking about gauges using methyl ether as the fluid. The bulb in the block has some fluid and some vapor. The vapor pressure increases with temperature so that a Bourdon tube pressure gauge is used to indicate temperature. The metal bulb and gauge are connected by a small diameter capillary tube. It is very easy to twist off the capillary tube when trying to remove the old sensor bulb from the cylinder head or the gauge from the dash. The Temperature Gauge Guy can turn around a gauge in about two weeks. Call Roy Martin, ate oh too - ate sicks too - sicks tree seben fore. Link to comment Share on other sites More sharing options...
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